package com.dheina.lazylist;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.Stack;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.beem.project.beem.R;
import com.beem.project.beem.ui.ContactList;


import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class ImageLoader {
    
    MemoryCache memoryCache=new MemoryCache();
    FileCache fileCache;
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
    ExecutorService executorService; 
    
    private int widthB = 0;
    private int heightB = 0;

    
    public ImageLoader(Context context){
        fileCache=new FileCache(context);
        executorService=Executors.newFixedThreadPool(5);
        photoLoaderThread.setPriority(Thread.NORM_PRIORITY - 1);
    }
    
    //Thumbnail Default
    final int stub_id=R.drawable.no_avatar;
    final int stub_idsmall=R.drawable.no_avatar;

    public void DisplayImage(String url, ImageView imageView)
    {
        imageViews.put(imageView, url);
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null)
            imageView.setImageBitmap(bitmap);
        else
        {
            queuePhoto(url, imageView);
            imageView.setImageResource(stub_id);
        }
    }
   
    
    
    /*
     * custome by awan
     * */
    public Bitmap getBitmapCache(String url){
    	//File f = fileCache.getFile(url);
    	//Bitmap bitmap = decodeFile(f);
    	
    	return memoryCache.get(url);
    }
    
    
   
    public void DisplayImage(String url, ImageView imageView, int width, int height)
    {
    	//Log.e(getClass().getName(),"DisplayImage"+url);
    	
    	/*if(url==null || url=="null" || url =="" || url ==" "){
    		Bitmap bmp = BitmapFactory.decodeResource(ContactList.cntx.getResources(),
                    R.drawable.no_avatar);
    		Bitmap resized = Bitmap.createScaledBitmap(bmp, width, height, true);
    		imageView.setImageBitmap(resized);
    	} else {*/
        	this.widthB = width;
        	this.heightB = height;
        	
            imageViews.put(imageView, url);
            Bitmap bitmap=memoryCache.get(url);
            if(bitmap!=null){
                imageView.setImageBitmap(bitmap);
                
            }
            else
            {
                queuePhoto(url, imageView);
                Bitmap bmp  = BitmapFactory.decodeResource(ContactList.cntx.getResources(),
                        R.drawable.no_avatar);
        		Bitmap resized = Bitmap.createScaledBitmap(bmp, width, height, true);
        		imageView.setImageBitmap(resized);
                if(widthB<=100){
                	imageView.setImageResource(stub_idsmall);
                }else{
                    imageView.setImageResource(stub_id);
                }

            }
    	//}

    }
        
    private Bitmap getBitmap(String url) 
    {
        File f=fileCache.getFile(url);
        
        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;
        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Throwable ex){
           ex.printStackTrace();
           if(ex instanceof OutOfMemoryError)
               memoryCache.clear();
           return null;
        }
    }

    //decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            FileInputStream stream1=new FileInputStream(f);
            BitmapFactory.decodeStream(stream1,null,o);
            stream1.close();
            
            //Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE=100;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=4;
                height_tmp/=4;
                scale*=1;
            }
      
            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            FileInputStream stream2=new FileInputStream(f);
            Bitmap bitmap=BitmapFactory.decodeStream(stream2, null, o2);
            stream2.close();
            if(widthB!=0 || heightB !=0){
        		Bitmap resized = Bitmap.createScaledBitmap(bitmap, widthB, heightB, true);
        		return resized;
        	}
            return bitmap;
            
            
        } catch (FileNotFoundException e) {
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    
    //===start----
    
    private void queuePhoto(String url, /*Activity activity,*/ ImageView imageView) {
		// This ImageView may be used for other images before. So there may be
		// some old tasks in the queue. We need to discard them.
		photosQueue.Clean(imageView);
		PhotoToLoad p = new PhotoToLoad(url, imageView);
		synchronized (photosQueue.photosToLoad) {
			photosQueue.photosToLoad.push(p);
			photosQueue.photosToLoad.notifyAll();

		}

		// start thread if it's not started yet
		if (photoLoaderThread.getState() == Thread.State.NEW)
			photoLoaderThread.start();
	}
	// Task for the queue
	private class PhotoToLoad {
		public String url;
		public ImageView imageView;

		public PhotoToLoad(String u, ImageView i) {
			url = u;
			imageView = i;
		}
	}

	PhotosQueue photosQueue = new PhotosQueue();

	public void stopThread() {
		photoLoaderThread.interrupt();
	}

	// stores list of photos to download
	class PhotosQueue {
		private Stack<PhotoToLoad> photosToLoad = new Stack<PhotoToLoad>();

		// removes all instances of this ImageView
		public void Clean(ImageView image) {
			for (int j = 0; j < photosToLoad.size();) {
				if (photosToLoad.get(j).imageView == image)
					photosToLoad.remove(j);
				else
					++j;
			}
		}
	}

	class PhotosLoader extends Thread {
		@Override
		public void run() {
			try {
				while (true) {
					// thread waits until there are any images to load in the
					// queue
					if (photosQueue.photosToLoad.size() == 0)
						synchronized (photosQueue.photosToLoad) {
							photosQueue.photosToLoad.wait();
						}
					if (photosQueue.photosToLoad.size() != 0) {
						PhotoToLoad photoToLoad;
						synchronized (photosQueue.photosToLoad) {
							photoToLoad = photosQueue.photosToLoad.pop();
						}
						Bitmap bmp = getBitmap(photoToLoad.url);
						memoryCache.put(photoToLoad.url, bmp);
						String tag = imageViews.get(photoToLoad.imageView);
						if (tag != null && tag.equals(photoToLoad.url)) {
							BitmapDisplayer bd = new BitmapDisplayer(bmp,
									photoToLoad.imageView);
							Activity a = (Activity) photoToLoad.imageView
									.getContext();
							a.runOnUiThread(bd);
						}
					}
					if (Thread.interrupted())
						break;
				}
			} catch (InterruptedException e) {
				// allow thread to exit
			}
		}
	}

	PhotosLoader photoLoaderThread = new PhotosLoader();
    
	// Used to display bitmap in the UI thread
		class BitmapDisplayer implements Runnable {
			Bitmap bitmap;
			Bitmap bref;
			ImageView imageView;

			public BitmapDisplayer(Bitmap b, ImageView i) {
				bitmap = b;
				imageView = i;
			}

			public void run() {
				if (bitmap != null) {
					//bref = getRefelection(bitmap);
					imageView.setImageBitmap(bitmap);
					// imageView.setBackgroundDrawable(new BitmapDrawable(bitmap));
				} else {

					// imageView.setBackgroundDrawable(new BitmapDrawable(bitmap));
					imageView.setImageResource(stub_id);
				}

			}
		}
		
    //---end ----
    
    /*private void queuePhoto(String url, ImageView imageView)
    {
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        executorService.submit(new PhotosLoader(p));
    }
    
    //Task for the queue
    private class PhotoToLoad
    {
        public String url;
        public ImageView imageView;
        public PhotoToLoad(String u, ImageView i){
            url=u; 
            imageView=i;
        }
    }
    
    class PhotosLoader implements Runnable {
        PhotoToLoad photoToLoad;
        PhotosLoader(PhotoToLoad photoToLoad){
            this.photoToLoad=photoToLoad;
        }
        @Override
        public void run() {
            try{
                if(imageViewReused(photoToLoad))
                    return;
                Bitmap bmp=getBitmap(photoToLoad.url);
                memoryCache.put(photoToLoad.url, bmp);
                if(imageViewReused(photoToLoad))
                    return;
                BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
                Activity a=(Activity)photoToLoad.imageView.getContext();
                a.runOnUiThread(bd);
            }catch(Throwable th){
                th.printStackTrace();
            }
        }
    }*/
    
    boolean imageViewReused(PhotoToLoad photoToLoad){
        String tag=imageViews.get(photoToLoad.imageView);
        if(tag==null || !tag.equals(photoToLoad.url))
            return true;
        return false;
    }
    
    //Used to display bitmap in the UI thread
   /* class BitmapDisplayer implements Runnable
    {
        Bitmap bitmap;
        PhotoToLoad photoToLoad;
        public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
        public void run()
        {
            if(imageViewReused(photoToLoad))
                return;
            if(bitmap!=null){
                    photoToLoad.imageView.setImageBitmap(bitmap);
            } else {
            	if(widthB<=100 && widthB!=0){
            		photoToLoad.imageView.setImageResource(stub_idsmall);
                }else{
                	photoToLoad.imageView.setImageResource(stub_id);
                } 
            }
        }
    }*/
    
    public void clearMemoryCache() {
        memoryCache.clear();
    }

    public void clearCache() {
        memoryCache.clear();
        fileCache.clear();
    }

}
